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1.
A fast scheme to generate Greenberger-Horne-Zeilinger states between different cavities in circuit QED systems is proposed. To implement this scheme, we design a feasible experimental device with three qubits and three cavities. In this device, all the couplings between qubit and qubit, cavity and qubit are tunable and are independent with frequencies, and thus the shortcut to adiabaticity technique can be directly applied in our scheme. It is demonstrated that the GHZ state can be generated rapidly with high fidelity in our scheme. 相似文献
2.
Generation of atomic Greenberger-Horne-Zeilinger states and cluster states through cavity-assisted interaction 下载免费PDF全文
This paper proposes a scalable scheme to generate n-atom GHZ states and cluster states by using the basic building block, i.e., a weak coherent optical pulse [α) being reflected successively from a single-atom cavity. In the schemes, coherent state of light is used instead of single photon source, homodyne measurement on coherent light is done kastead of single photon detection, and no need for individually addressing keeps the schemes easy to implement from the experimental point of view. The successful probabilities of our protocols approach unity in the ideal case. 相似文献
3.
A scheme is proposed to simulate the Ising model and preserve the maximum entangled states (Bell states) in cavity quantum
electrodynamics (QED) driven by a classical field with large detuning. In the strong driving and large-detuning regime, the
effective Hamiltonian of the system is the same as the standard Ising model, and the scheme can also make the initial four
Bell states of two atoms at the maximum entanglement all the time. So it is a simple memory for the maximal entangled states.
The system is insensitive to the cavity decay and the thermal field and more immune to decoherence. These advantages can warrant
the experimental feasibility of the current scheme. Furthermore, the genuine four-atom entanglement may be acquired via two
Bell states through one-step implementation on four two-level atoms in the strong-driven model, and when two Greenberger-Horne-Zeilinger
(GHZ) states are prepared in our scheme, the entangled cluster state may be acquired easily. The success probability for the
scheme is 1.
Supported by the National Natural Science Foundation of China (Grant No. 10774088) and the Key Program of the National Natural
Science Foundation of China (Grant No. 10534030) 相似文献
4.
5.
N个热囚禁离子的GHZ态的制备 总被引:1,自引:1,他引:0
我们提出了一个简单的方法产生N个囚禁离子的GHZ态.在这个方法中,初始时处于相同态的N个两能级离子被囚禁在一个线性阱中,同时被两束均匀的经典激光照射.这个方法对振动模的加热不敏感,从退相干的观点来看这点很重要. 相似文献
6.
Based on the input-output relation of the cavity and the Faraday Rotation mechanism, we propose a scheme for generating the n-atom Greenberger Horne-Zeilinger state. In the scheme, the n-atom trapped respectively in n spatially separate cavities would be entangled with the photons going through the atom-cavity system. The successful probabilities of our protocol approach unity in the ideal case. What is more, no requirement for separately addressing further lowers experimental difficulties. 相似文献
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8.
We propose a scheme to generate a Greenberger-Horn-Zeilinger (GHZ) state of four atoms trapped in a two-mode optical cavity via an adiabatic passage. The scheme is robust against moderate fluctuations of the experimental parameters. Numerical calculations show that the excited probabilities of both the cavity modes and the atoms are tiny and depend on the pulse peaks of the classical laser fields. For certain decoherence due to the atomic spontaneous emission and the cavity decay, there exits a range of pulse peaks to get a high fidelity. 相似文献
9.
We present two schemes for concentrating unknown nonmaximally
entangled Greenberger-Horme-Zeilinger (GHZ) or W class states. The first scheme for concentrating
the nonmaximally entangled GHZ state is based on linear optical
devices. The second scheme for concentrating the W class states
can be applied to a wide variety of atomic state. Both of our
schemes are not postselection ones and are within the current technologies. 相似文献
10.
A nearly deterministic scheme for generation of multiphoton GHZ states with weak cross-Kerr nonlinearity 下载免费PDF全文
We propose a scheme to generate polarization-entangled multiphoton Greenberger-Horne-Zeilinger (GHZ) states based on weak cross-Kerr nonlinearity and subsequent homodyne measurement. It can also be generalized to produce maximally N-qubit entangled states. The success probabilities of our schemes are almost equal to 1. 相似文献
11.
We propose a protocol to generate Greenberger-Horne-Zeilinger (GHZ) and W states of three atoms trapped in only one cavity. The setup involves one cavity and linear optical elements. The quantum information of each qubit is skillfully encoded on the degenerate ground states of the three different atoms, hence the entanglement between them is relatively stable against spontaneous emission. The advantages of the protocol are their robustness against detection inefficiency and asynchronous emission of the photons. We discuss the issue related to the practical implementation and show that the protocol is accessible within the current cavity QED technology and linear optical technology. 相似文献
12.
13.
By using the theory of cavity QED, we study the system in which a two-level atom interacts with a cavity in the case of large detuning. Through the selective detecting of atomic state, Schrodinger cat states and entangled coherent states are easily generated. When the atom is driven by a weak classical field and the cavity field is in the Schrodinger cat state, we study the conditions of generating the Fock states and the maximal success probability. The maximal success probability in our scheme is larger than the previous one. 相似文献
14.
A Feasible Scheme for Teleportation of Multi-atom Cat-like States in Thermal Cavities 总被引:4,自引:0,他引:4
An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states in cavity QED is proposed. In the scheme the atoms interact simultaneously with a highly detuned cavity mode and are driven by a strong classical field, and the atomic state evolution is independent of cavity field state. Thus the scheme is insensitive to both the cavity decay and the thermal field, which is of importance from the experimental point of view. All the orthogonal and complete multi-atom GHZ states can be exactly distinguished only by one step, so our scheme can also be used for other purposes such as dense coding using multi-atom GHZ states as quantum channels. 相似文献
15.
Controlling dipole squeezing of two atoms inside a cavity via manipulating an atom outside the cavity 总被引:3,自引:0,他引:3 下载免费PDF全文
Considering that three two-level atoms are initially in the GHZ single state and two of the atoms are simultaneously put into a cavity initially in the coherent state, we investigate the dipole squeezing properties of the two atoms inside the cavity under the condition of resonant interaction. It is shown that dipole squeezing properties of the two atoms inside the cavity are strongly affected by rotation manipulating of the atom outside the cavity. 相似文献
16.
We propose a scheme for preparing four-particle
Greenberger--Horne--Zeilinger states using two identical bimodal
cavities, each supports two modes with different frequencies. This
scheme is an alternative to another published work [Christopher C
Gerry 1996 {\it Phys. Rev.} A {\bf 53} 4591]. Comparisons between
them are discussed. The fidelity and the probability of success
influenced by cavity decay for the generated states are also
considered. 相似文献
17.
We propose two schemes for concentrating unknown
nonmaximally tripartite GHZ entangled states via cavity quantum
electrodynamics (QED) techniques. The
finial pure states obtained from the two schemes are shared by two or three
parties. Our schemes only require large-detuned interaction between two
driven atoms and the quantized cavity mode, which is insensitive to both the
cavity decay and thermal field, thus the schemes are well within current
experimental technology. 相似文献
18.
Quantum entangled states, especially those having particular properties, are key resources for quantum information and quantum computation. In this paper, we put forward a new scheme to produce 31 continuous–variable(CV) tripartite entanglement fields based on three optical frequency combs via cascade nonlinear processes in an optical parametric cavity,and investigate the spectral characteristics of three frequency combs. The center wavelengths of the three combs are designed as 852 nm, 780 nm(atomic transition lines), and 1550 nm(fiber communication wavelength). The positivity under partial transposition(PPT) criterion, which is sufficient and necessary, is used to evaluate the entanglement in each group of comb lines. This scheme is experimentally feasible and valuable for constructing quantum information networks in future. 相似文献
19.
A scheme to generate multi-atom one-dimensional cluster state via one microwave cavity with an additional driven classical field is proposed. According to the scheme, one-dimensional cluster state with 2k-atom can be prepared in one step via one cavity, one-dimensional cluster state with (2k-1)-atom can be generated by measuring the2kth-atom of an 2k-atom cluster state in a certain basis. This scheme avoids cavity-field induced decay and may achieve one-dimensional cluster states with ideal success probability. 相似文献
20.
We propose a scheme to achieve a kind of nontrivial multipartite pair-wise controlled phase operation in a cavity QED setup. The operation implemented is of geometrical nature and is not sensitive to the thermal state of the cavity. In particular, we have managed to avoid the conventional dispersive coupling so that high speed gate operation is achieved which is very important in view of decoherence. We show that this multipartite pair-wise controlled phase operation makes the generation of two-dimensional cluster states very efficient. 相似文献